The velocity distribution of Sloan Digital Sky Survey satellites in Modified Newtonian Dynamics

2007/09/12 by Garry Angus, G. W. Angus, Benoit Famaey +7 · 2 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #Radio Astronomy Observations and Technology #astro-ph

paper · pdf · doi:10.1111/j.1745-3933.2007.00393.x

published as 2008, MNRAS, 383, L1 · 5 pages, 1 figure, accepted for publication in MNRAS Letters

arxiv created 2007/09/12 · openalex publication_date 2008/01/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Abstract The recent Sloan Digital Sky Survey measured velocity distribution of satellite galaxies has been modelled in the context of Modified Newtonian Dynamics (MOND). We show that even when the extra constraint of adhering to the projected satellite number density profile is added, the two line-of-sight (los) velocity dispersion profiles presented in Klypin & Prada can be matched simply with a radially varying anisotropy. Interestingly, the anisotropies required to fit the los velocity dispersions are remarkably similar to the anisotropies generated by dissipationless collapse simulations in MOND. The mass-to-light ratios of the two host galaxies used are sensible, and positivity of the distribution function is satisfied.

Citations

• A modification of the Newtonian dynamics - Implications for galaxies
• A modification of the Newtonian dynamics as a possible alternative to the hidden mass hypothesis
• A direct empirical proof of the existence of dark matter
• A Modification of the Newtonian Dynamics - Implications for Galaxy Systems

Cited by

• The relation between stellar mass and weak lensing signal around galaxies: implications for modified Newtonian dynamics
• Self‐consistent Models of Triaxial Galaxies in MOND Gravity